Stoker mechanism.



W. C. A. HENRY.

STOKER MECHANISM.

APPLICATION mu) JULYZI. 1913.

Patented Apr 6, 1915.

NVENTOR WITNESSES 50 bearings are all provided with bushings tion.

WILLIAIVJI C. A. HENRY, OF COLUMBUS, OHIO.

sroKER MECHANISM.

Specification of Letters Patent.

Patented Apr. 6, 1915.

Application filed July 21, 1913. Serial No. 780,160.

To all whom it may concern:

Be it known that I, \VILLIAM C. A. HENRY, a" citizen of the United States, residing at Columbus, in the county of Franklin and State of. Ohio, have invented certain new and useful Improvements in Stoker Mechanism, of which the following is a specifica- The invention relates to automatic stoker mechanism and has for its primary objects, the provision of an arrangement whereby the packing of the coal under the plungers is avoided; the provision of means to prevent packing of the coal in the bearings through which the plungers work; and the provision of improved means for applying the power to reciprocate the plungers whereby binding and undue friction is eliminated.

ertain embodiments of the invention are illustrated in the accompanying drawings, wherein- Figure 1 is a longitudinal section through a feed trough of an underfeed Stoker embodying the invention, Figs. 2 and 3 are sec- J tions on the lines II-II and TIL-III respectively of Fig. 1, Fig. i. is a longitudinal section through a modified construction, and Fig. 5 is a section on the line of V-'V of Fig. 4.

Referring to the drawings, 1 is the underfeed trough of a furnace, the side gates not being shown; 2 is the main feed piston at the rear end of the trough, which is reciprocated by any desired means; 3, 4:, and 5, are secondary feed plungers working through the bottom'of the trough and provided with an agitator 6; 7' is a rock shaft operated from power means, for operating the secondary plungers, and 9 is one of a pair of bars lying on opposite sides of the crank 8 and connected at their front ends with the secondary plunger, by-

means of the transverse bolts 10.

The rear secondary plunger 3 is guided in two bearings 11 and 12, the bearing 11 being located at the pointat which the plunger enters the trough through the bottom thereof, and the bearing 12 being placed to the rear'of the bearing 11. The two connecting rods of course straddle the bearing 12. The

which are held in place by means of the set screws 13 (Fig. 2) held in position by means of the nut locks illustrated.

The secondary plunger 4 is also operated from the connecting rods 9, such connecting and provided with a crank 8 rods being extended downward as indicated at 1%. The pair of connecting rods 15 are connected at their rear ends to the down- Wardly projecting portion ll, by means of a transverse bolt or rod 16, and are connected at their forward ends to the plunger 4: by means of the bolt 17. This plunger is supported in a pair of bearings 18 and 19, and the connecting rods 15 straddle the rear bearing 19 and the plunger itself.

The forward secondary plunger 5 is guided in a pair of bearings 20 and 21, and is operated by a pair of connecting rods secured at their rear ends to the downwardly pro3ecting portions l-l, by the bolt ll, and at their front ends pivoted to the rear end of the plunger by means of the bolt It will be noted that each of the plungers 3, L, and 5 is guided in a pair of bearings spaced apart, and that the front bearing in each case is relatively short. This is an advantageous construction, in that any coal which works into the front bearing from the trough easily works through and escapes from the rear side of the bearing, whereas with a single long bearing the coal would be much more apt to collect in the'bearing and cause a large amount of friction. It will also be noted that this arrangement of bearings spaced apart permits the actuation of the plungers by connections attached intermediate the two bearings. This reduces the binding and friction which ispresent where a single long bearing is used with the driving connection to the rear of such bearing. This tendency to bind is of course due to the fact that the application of power from the c ,anecting rod to the plungers is not exact y in alinement with the directionof movement of the plungers, but is in some positions of the connecting rods applied at an angle, causing binding and undue wear at the ends of the bearing. lVith two separated bearings such as those illustrated with the application of power therebetween this tendency to bind is substan tially eliminated. It will also be'noted that insofar as the plungers t and 5 are concerned the application of power from the dependingportions 1.4 is always exactly in alinement with the path of movement of the plungers, since the rear plunger 3 acts as guide for the portions 14, so that any tendency towardmovement at right angles to the path of movement of the plungers L and 5 is eliminated. The rear plunger 3 slots. By the use of these slots substantially therefore acts as a guide or cross head for the plungers 4 and 5, and frictional losses tion at these points. In order to relieve this condition I have provided the slots 24 under each secondary plunger. These slots are always-covered by the plungers, so that there is no loss of coal due tothem, but

. when the fine coal or dust works back to these points beneath the plungers it is ,free

to drop out, instead of collecting and pack ing. The portions of the bottom of the trough in advance of theslots are cleaned by the plungers themselves, since the plun gers ride back a sufficient distance to uncover the portions of the bottom in front of the all friction incident to the collection and packing of the fine coal is eliminated, and

the plungers work freely at all times.

Figs. 4 and 5 illustrate the application of the slottingprinciple just described, to a modified type of plunger or agitating means. In this construction of Figs. 4 and 5 there is only a single plunger 25 working on the bottom of the trough 26, such plunger being provided with a v plurality of upstanding agitators 27.

The plurality of slots .28 in -the bottom of the trough beneath the plunger prevent any packing of the coal, as

the fine coal which would otherwise collect and pack drops throughthe bottom.

- signed. my name in the WhatI claim is: z

1. In combination with a feed trough, a plunger inclined with respect" to. the trough and working through the bottom thereof, a bearing for the plunger where it passes through the bottom of the trough, a'seeond bearing for the plunger spaced to the r-ear of the other bearing, means for; operating the plunger secured thereto intermediate'the two bearings, a second-plunger in advance,

of the first mentioned plunger, -and a..con-

nectionfrohr said first mentioned. plunger.

intermediate the twobearings foroperating the said secondplungerr 2-. Incombination-w-ith affeed trough, a; plunger inclined with respect to the trough and working through the bottom thereof, a bearing for the plunger Where it passes through the bottom of the trough, a second bearing for the plunger spaced to the ..rear

of the other .bearing, a connecting rod piv:

oted to the plunger intermediate the two means for operating the? connecting rodya second plunger in advance. of- 'the' first operating said second plunger,,said connectplunger and also Workingthroughthe bottom of the trough, and a connectin'g rod .for-

ing rod beingpivoted at one end to said sec- 0nd plunger and at the other end being piv oted to the said downward extension. I

, In testimony whereof I have hereunto subscribed witnesses.

. WILLIAM (IA. HENRY. Witnesses: r

W. W. BEUBE, A. B. JONES presence of the two 6O bearings and having a downward extension, 

